Patent US3680553A successfully refreshed from Google Patents.
US2500267A
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Apparatus for drilling deflecting well bores
Assignee: Individual
•
Filing: 1945-03-26
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Granted: 1950-03-14
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Expires: 1965-03-26
Abstract
No abstract record available.
Inventors
- 👤 John A Zublin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:24
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2336338A
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US2167194A
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US2332933A
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US2327693A
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US2344277A
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US2336336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |